Abstract:

A masson pine ( Pinus massoniana ) provenance, Guangdong 5, that was selected from 40 provenances by repeated selections, had resistance to both pine wilt disease (PWD) and maturation feeding by the adults of Monochamus alternatus . When inoculated pine wood nematode, resistant masson pine provenances produced more terpene components, such as longifolene, and phenolic compounds. Provenances with resistance to maturation feeding by the adults of M. alternatus contained more contents of monoterpene, sesquiterpene, caryophyllene, however fewer longifolene, which may be related to difference in the feeding habits of PWD and M. alternatus . It was found that the provenances containing low content of free amino acids had resistance to adults of M. alternatus maturation feeding and PWD, confirming that low content of free amino acids in masson pine had strong resistance. The resistant provenances also had compacted bark organization and grew vigorously.

Key words: masson pine provenances, anti-maturation feeding by the adult of M.alternatus, resistance to pine wilt disease, resistance mechanism